Travel on the VWP also requires that travelers must register with ESTA on-line at https://esta.cbp.dhs.gov and receive approval.

Who needs a visa?

A non-immigrant visa is still required for travelers:

• who are citizens of countries that do not participate in the Visa Waiver Program;

• who wish to travel to the United States for more than 90 days;

• who arrive on a private aircraft or vessel;

• who have a diplomatic or official passport AND are traveling to the United States on official government business;

• As of July 1, 2009 Visa Waiver Program (VWP) countries' emergency and temporary passports are subject to the electronic passport (e-passport) requirement.

• who do not have an approved ESTA;

• who wish to travel to the United States in order to study (as part of an exchange program or to undertake academic or vocational studies at an educational institution);

• who intend to accept paid or unpaid employment in the United States (also applies to au-pairs, interns, representatives of the foreign press, radio, film, journalist or other information media, engaging in that vocation while in the US);

• who are professional performers such as an actors, athletes, musicians, or other artists.